Conducting Health Research: Principles, Process, and Methods presents an integrated and practical introduction to the principles and strategies for planning, implementing, reporting, and assessing health sciences research. Comprehensive in its breadth and depth, with an accessible writing style, this text prepares students in public health and related fields to be adept researchers and consumers of health research. Through real-world examples and step-by-step guidance, Frederick J. Kviz provides students with the skills they need to: identify and evaluate research strengths and limitations as practitioners; to actually perform the various core aspects of research; and to choose among alternative methods when making decisions about health practice, policy, and future research needs.

Random Sampling and Assignment

Random Sampling and Assignment

Random Sampling and Assignment

A man stands on the other side of a glass board with 19 male and female icons on it, in a grid. He uses a marker pen to place tick marks against some of these icons. A conference room with a long table and chairs are seen in the background.

Learning Objectives

After studying Chapter 7, the reader should be able to:

  • Describe the principles of random sampling and how they enhance a sample’s representativeness of a population
  • Select and apply a sampling design appropriate for a specific research question, population, and study design
  • Assess a sample’s representativeness of a population
  • Select and apply an appropriate method for randomly assigning subjects to study conditions


After developing a research design, subjects is the next stage in the research process as presented in Chapter 1 (Figure 1.5). Virtually all research involving human subjects is conducted with a sample that is a representative subset of a target population. Taking into consideration a study’s particular circumstances, a key aspect of external validity is whether the sample selection ...

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